Equipped with or surrounded by a fortress; made into a fortress or protected like one.
From 'fortress' (Old French 'forteresse,' from Latin 'fortis' meaning 'strong') plus the '-ed' suffix to form a past participle or adjective. The word evolved to describe something converted into a stronghold or heavily defended.
Medieval cities would literally 'fortress' themselves by building walls and ramparts—and today we still use this word metaphorically when someone 'fortresses' their bedroom or a company 'fortresses' its data centers, showing how medieval protection vocabulary shapes modern security language!
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